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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef _SECRNG_H_
#define _SECRNG_H_
/*
* secrng.h - public data structures and prototypes for the secure random
* number generator
*
* $Id: secrng.h,v 1.7 2012/04/25 14:49:43 gerv%gerv.net Exp $
*/
/******************************************/
/*
** Random number generation. A cryptographically strong random number
** generator.
*/
#include "blapi.h"
/* the number of bytes to read from the system random number generator */
#define SYSTEM_RNG_SEED_COUNT 1024
SEC_BEGIN_PROTOS
/*
** The following functions are provided by the security library
** but are differently implemented for the UNIX, Win, and OS/2
** versions
*/
/*
** Get the "noisiest" information available on the system.
** The amount of data returned depends on the system implementation.
** It will not exceed maxbytes, but may be (much) less.
** Returns number of noise bytes copied into buf, or zero if error.
*/
extern size_t RNG_GetNoise(void *buf, size_t maxbytes);
/*
** RNG_SystemInfoForRNG should be called before any use of SSL. It
** gathers up the system specific information to help seed the
** state of the global random number generator.
*/
extern void RNG_SystemInfoForRNG(void);
/*
** Use the contents (and stat) of a file to help seed the
** global random number generator.
*/
extern void RNG_FileForRNG(const char *filename);
/*
** Get maxbytes bytes of random data from the system random number
** generator.
** Returns the number of bytes copied into buf -- maxbytes if success
** or zero if error.
** Errors:
** PR_NOT_IMPLEMENTED_ERROR There is no system RNG on the platform.
** SEC_ERROR_NEED_RANDOM The system RNG failed.
*/
extern size_t RNG_SystemRNG(void *buf, size_t maxbytes);
SEC_END_PROTOS
#endif /* _SECRNG_H_ */
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